RADical - A Radiosity Renderer

RADical is radiosity based renderer. It creates photo-realistic images using a rendering
technique called radiosity.It reads a text `scene' file containing information
about the scene an image of that scene by modelling the interaction of light with various objects
in the scene on the basis of an energy (read heat) transportation
theory.

If at this point you are wondering what is radiosity, check out KODI's Radiosity page. Also, RADical draws its method from another radiosity engine called GLUTRAD. So it is also an OpenGL based implementation of radiosity, and uses the same technique as GLUTRAD.